Malicious PDF — malware analysis report

Static analysis result for SHA-256 246f43c11da7936a…

MALICIOUS

PDF

45.0 KB Created: 2020-11-08 16:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1ad7407d6ba5d4f9fcbe8c57a8759c41 SHA-1: d596bb20833001f6bc8cba4d4bd93b6a5fbb0b6a SHA-256: 246f43c11da7936a7096fe99076440cf0d5578b775d48b1ae89d2daa0fe2ad97
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=choice+of+games+apk+full In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_5f9ee31c957d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5f9ed76d8eeb1.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/558ef243d08de1.pdfIn PDF document text
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/b73c08996e703.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/soxanudamun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/subud/xapasiluvodizusakunitefer.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vudijigubexonesiso.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/introduction_mathematical_thinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed31ae0-0fd2-4b47-82b6-71b66740a261/92557103230.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/89363266534.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/73_questions_vogue_list_selena_gomez.pdfIn PDF document text
    • https://tilidefixof.files.wordpress.com/2020/11/coulombic_attraction_pogil_answer_key_extension_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/sepupav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FA 5116 bytes
SHA-256: 26b681c8fc329d1e1fb2fbeb549c559905b8bfa8ba8b02b03b0140bef7d918d0
font_01_sfnt_off00007273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 11516 bytes
SHA-256: 55f4413756476a9de4622bc1d3a8cc01480fb71f7169c869db77b976fcb788d3
font_02_sfnt_off0000995f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x995F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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